The other day I sank my first ore carrier. My eel hit her right in middle and I thought maybe I would get to see a Titanic like sinking. However, for two hours she kept on going at 3/4 knots and I finally came up and gave her around 20 rounds from my deck gun. Another two hours, still nothing.
So I finally used one more eel and this time after another hour I finally hear 'she's going down!'

Hard work rewarded.
A noob question, what is the difference between impact and magnetic torpedoes? I know how it works, I mean what are the advantages and disadvantages of each of em?